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A flight crew of a performance class A aeroplane are preparing for departure on a short and wet runway. Only the Captain has run the performance figures using an application on their electronic flight bag (EFB), and has not crosschecked the results with the first officer, who is busy preparing the departure routing. The Captain has incorrectly calculated a V1 of 118 kt and entered it into the FMS. The VMCG is 120 kt, VR is 123 kt, V2 is 130 kt

During take-off, the pilot monitoring calls V1 at the FMS selected V1 speed, at which point an engine failure occurs. The flight crew continue the takeoff roll.

What would be the most likely scenario in this event?

  • A

    It will stall upon reaching V2

  • B

    It will take off and climb normally

  • C

    The aircraft will veer to one side, but takeoff safely

  • D

    The aircraft will laterally overrun the runway

V1 is the decision speed for take-off. Before V1 is called, any significant failure of the aircraft, such as an engine failure or fire, will require the take-off to be rejected. Above the V1 speed, the crew must continue the take-off regardless of any failure, and the option to stop on the runway is no longer available.

In this case, the crew are using an incorrectly calculated V1 of 118 kt. This means that a failure which is recognized and acted upon after the "V1" call, so the pilot flying will continue the take-off. However, the aircraft has not yet reached its VMCG (minimum control speed on ground), which means the crew will not be able to maintain directional control due to the thrust from the operative engine and insufficient airflow over the rudder. As a result, the aircraft is likely to run off the runway laterally and not take off.

Note: Parts of this question are based on incomplete feedback. If you happen to encounter this question in your exam, we appreciate any feedback you can provide. Thank you!

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